HELP! At school this guy sold me a Doom 3 blank disc with "Legit Looking" sharpie on the front for $15. I already had Doom 3 but it was cheap so What the heck. It had a bonus: RoE! RoE worked fine but Doom 3 Freezez up when your shot by a Pistol Z-sec. Help?? Also the game looks Pirated.